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So I'm going to pick one of these two wireless systems up soon but I don't know which one would actually be better.

Then Sennheiser EW 100-ENG G3 is a proven workhorse from everything I've seen/read etc but the one I would be picking up uses the 516-558MHz UHF range which is safe for quite a while but I wonder if the Sennheiser AVX system would be a smarter move as it uses the 1.9ghz frequency range.

I bought an AVX lav kit a few months ago for use on a documentary. It worked flawlessly on interiors and exteriors in downtown NYC. No drop outs, no interference, good sound quality. The main complaint I've heard about is the smart AGC/ limiter function, which can't be turned off. there are no manual adjustments on the system transmitter or receiver. However I found that to work flawlessly as well, no gain pumping or other artifacts from the AGC. Makes solo work for interviews and docs easy. You only need to set level once on the camera. Serious sound guys on narrative films don't like the lack of control. I like the tiny receiver. battery life seemed fine for full day shoots, though the receiver battery is small and may need recharging. I never ran out of juice. You can get spare batteries for it, but it uses a proprietary lithium ion battery.
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Dose, I'm interested in the same question. I was leaning towards the AVX for great convenience, but as razz16mm indicates, others here recommended I go with the earlier proven solution. If you search on AVX, you may find that discussion. I'm too full of turkey soup to be able to manage a Search myself!